Physics – Atomic Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4491b&link_type=abstract
HST Proposal ID #4491
Physics
Atomic Physics
Hst Proposal Id #4491
Scientific paper
We propose to make the first unambiguous detection of O++ in the hot region of the Io plasma torus near Io's orbit. The abundance of this ion is diagnostic of the ion partioning in this region of the torus where Voyager could not make a definite detection, and upper limits or tentative detections made from ground-based and space-borne instruments give conflicting abundances differing by more than an order of magnitude. The long exposure required for the O++ detection will also make the first measurement of the longitudinal behavior of the strong FUV emission by the S++ torus ions. This needs to be done in the FUV, since longitudinal variations have been observed in the visible and EUV but with different characteristics. Another bonus from this long exposure will be the detection of the neutral S cloud in the torus (far from Io) in its strongest FUV multiplets. These multiplets have more certain atomic physics parameters than for the ones previously detected and will thus provide a better measure of the cloud density relevant to the torus mass loading. We will also make the first high resolution spectroscopic observation of O+, the main torus component near Io. By resolving the emission we will determine the ion's velocity distribution, which is diagnostic of the energy balance and injection of ions into the torus.
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